from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

#需要 mysqlclient
SQLALCHEMY_DATABASE_URL = "mysql+pymysql://user:password@ip:port/db?charset=utf8mb4"
# SQLALCHEMY_DATABASE_URL = "postgresql://user:password@postgresserver/db"

engine = create_engine( SQLALCHEMY_DATABASE_URL )
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()